This equipment is widely used in the automatic welding production of automobile girders and construction machinery “I” beams. The control system adopts centralized control and can be applied to automatic welding equipment for constant cross-section, variable cross-section, arched H-beams, and trailer longitudinal beams. It is equipped with automatic welding seam tracking device and automatic flux recovery device. The welding speed is controlled by a frequency converter, stepless speed regulation, stable and reliable operation, and fast return function, simple operation and high work efficiency. The schematic diagram is as follows (the product is subject to the actual product)